Mill.



No. 817,610. PATENTED APR. 10, 1906.

D. L. ADELSPERGER.

MILL. APPLICATION FILED DEO.26,1902.

A ORE W] TNESSES UTED STATES rarnyr orrron.

DOW L. ADELSPERGER, OF SPRINGFIELD, OHIO, ASSIGN OR TO THE FOOSMANUFACTURING COMPANY, OF SPRINGFIELD, OHIO, A CORPORATION OF OHIO.

MILL.

Specification of Letters Patent.

Patented April 10,1906.

To all whom, it may concern:

Be it known that I, Dow L. ADELSPERGER, a citizen of the United States,residing at S ringfield, in the county of Clark and State Ohio, haveinvented certain new and useful Improvements in Mills, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

This invention relates to mills, and more particularly to that class ofattrition or grinding mills in which two disks or heads are employedrevolving in parallel planes in opposite directions, the material beingfed in between the disks or heads through an eye or central opening inone of the heads.

The object of my present invention is to insure a positive and evenfeeding of the material to and through the aforesaid eye or opening; andto this end my invention consists in certain novel features, which Iwill now proceed to describe and will then particularly point out in theclaims.

In the accompanying drawings, Figure 1 is a View, partly in elevationand partly in central vertical section, of a mill having my improvementapplied thereto. Fig. 2 is an enlarged detail view of a portion of Fig.1, but with the feeding disk or head so turned, that its spokes are in adifferent position. Fig. 3 is an enlarged elevation of one side of whatis shown in Fig. 2. Fig. 4 is a plan section taken on the line w cc ofFig. 2 and looking in the direction of the arrows, and Fig. 5

' is a detail perspective view showing the interior of the lower-part ofthe feed-throat.

In the said drawings, 1 indicates an inclosing casing, 2 the closedhead, and 3 the open head, said heads being mounted, respectively, onshafts 4 and 5, rotating in opposite directions, and said heads beingprovided with suitable grinding-plates 6. As usual in mills of thistype, the head 3 is pro vided with an annular opening 7 around itscenter, through which opening the material is fed, the hub portion 8 ofthe head being connected with the annular body portion by spokes or arms9. The material to be operated upon is fed downward toward this eye oropening through a feed-spout 10 by any suitable meanssuch, for instance,as the feeding mechanism 11 shown. The spokes or arms 9 in mills of thistype are beveled or inclined, as shown in section in Fig. 4, theirwidest portions being on the outer or receiving side, so that after thematerial has passed the outer edge of the spokes or arms these latterwill act to feed it onward into the space between the two heads. Inorder to conduct the material from the feed-spout to the eye or opening,there is employed a feedthroat 12, into the top of which the feedspoutdischarges and which has the side thereof toward the eye or opening openor unobstructed, while its other or outer side is closed by an. inclinedwall 13, the inclination of which is downward and inward toward thebottom of the eye or opening. Preferably this feed-throat is made in twosections, an upper section 14 above the shaft 5 and a lower section 15below said shaft. From an inspection of Fig. 5 it will be seen that theouter wall 13 is inclined downward and inward in the manner alreadydescribed, while the side walls 16 also converge downward, so as toconduct the material toward the eye. It has been found in practice,however, that there is at times a tendency of the material to pack inthe lower part of the throat, so that it does not feed properly into theeye. To overcome this objection, I locate in said throat a central rib17, extendin vertically thereof and having converging si es 18, theirconvergence being outward with respect to the throat or toward thedischarge side thereof and their rear upright edges 19 mergin with andlying in the plane of the incline back 1.3, while their front or outeredges 20 lie immediately adjacent to the path of the outer faces of thespokes 9, being preferably slightly separated, so that the rib has afiat front edge 21. It will thus be seen that the rib 17 projectsconsiderably outward from the back of the throat at its upper part,practically merging into the back of the throat at its lower part andbeing of a gradually-diminishing thickness from top to bottom both lonitudinally and transversely. By reason of'this construction the materialas it descends through the lower portion of the throat is forced outwardto the eye or opening of the head not only by the inclined rear and sidewalls of the throat, but also by the inclined sides of the rib, and isthus more certainly and positively conducted to the point where itenters the eye and is fed forward by the spokes.

i i i nected with the outer annular body portion 5 by spokes extendingradially across the eye the packing of the material in the lower part ofthe feed-throat, hereinbefore referred to, frequently arises from thefact that the material clogs in the eye of the head and will not passthrough. This is particularly the case where fibrous material of anyConsiderable length is being operated upon. Where the wall 13 of thefeeding-throat. diverges from the outer edge of the eye, there is leftbetween the outer faces of the spokes and the wall of the feed-throat anopen space, and fibrous material, such as corn husks, lying partlywithin the eye, may extend out beyond the head into this clear space inthe feed-throat and even be pressed against the outer face of the spokesor become wrapped around the same. In either case the only force actingto press this projecting material into and through the eye is thepressure exerted by the material in the feed-throat. This is sometimesinsufficient to force the m aterial thus located wholly into the eye,and the result is that said material is carried around and aroundwithout passing through the eye, thereby clogging or entirely stoppingthe feed. My improved construction provides a remedy for this difficultyby rea' son of the fact that there is in the feed-throat a projectionlying close to the outer face of the head at a point inward from theouter edge of the receiving-eye, which projection positively engageswith any material protruding from the eye on the feed side and compelsit to enter and pass through the eye. Thus the rib 17 constitutes ascraping proj ection of the character just described, whichindependently of its function of guiding the material to the eye, whichfunction has already been fully described herein, also serves to preventclogging of the eye, and there fore insures proper feeding of thematerial operated on through the eye.

In order to prevent breakage of the parts when a hard body of sufficientsize is accidentally present in the material operated upon, I prefer toconstruct the rib 17 in aseparate piece from the remainder of the throatand to hold it inwposition by a frangible sup-' porting-arm, which willbreak and permit the rib to yield outwardly under undue pressure. Tothis end I prefer the construction shown, in which the rib 17 isconstructed in a separate piece, fitting an opening in the rear wall ofthe throat, and supported by an arm 22 of frangible material secured toany suitable portion of the casing-as, for example, the base-flange 23of the throat-section 15. In this construction the frangible arm 22 hasa foot 24, secured in position by a bolt 25, and is provided with ascrew-bolt 26, passing through a threaded aperture in its upper end andbearing against the rear face of the rib l7. Said rib is provided withmarginal flanges 27, which bear against the outer surface of the rearwall 13 of the throat and limit its motion toward the eye under pressure of the screw 26, which thus holds it securely in position withinthe throat. Undue pressure on the inclined walls of the rib will causethe arm 22 to break and permit the rib to yield outward, thus preventingany permanent damage to the mill and permitting the objectionable objectto pass out of the opening thus provided.

It will be observed that the central inclined rib is of equal etlicicncyin whichever direction the open head may be revolved and willeffectively prevent any clogging of the lower portion of the throat. Itwill also be understood that although I prefer to cpnstruct the rib of aseparate piece yieldingly supported my invention is not limited to suchpreferred construction, since the automatic relief feature may bedispensed with in the broader form of my invention. Furthermore, wherethe mill is designed to run in one direction only only one of theinclined sides of the rib is necessary, so that the rib might be dividedlongitudinally into two parts, either or both of which might be used, asdesired. Moreover, various modifications in the details of constructionwill readily suggest themselves to one skilled in the art, and Itherefore do not wish to be understood as limiting myself to the precisedetails hereinbefore described, and shown in the accompanying drawings.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, of a feeding-throat having walls converging downwardlytoward said opening and open on the side adjacent thereto, and a centralrib or projection extending longitudinally within said throat, thecentral plane of said rib being coincident with the vertical plane inwhich the axis of revolution of the head or disk lies, and the free edgeof the rib being substantially in the vertical plane of thedischarge-mouth of the throat, substant ally as described.

2. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, of a feeding-throat having walls converging downwardlytoward said opening and open on the side adjacent thereto, and a centralrib or projection extending longitudinally within said throat and havinga side Wall inclined from the back of the throat toward the opening, thecentral plane of said rib being coincident with the vertical plane inwhich the axis of revolution of the head or disk lies, and the free edgeof the rib being substantially in the vertical plane of thedischarge-mouth of the throat, substantially as described.

3. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, of a feeding-throat having walls converging downwardlytoward said opening and open on the side adjacent thereto, and a centralrib or projection extending longitudinally within said throat, andhaving side walls converging from the back of the throat towardtheopening, the central plane of said rib being coincident with thevertical plane in which the axis of revolution of the head or disk lies,and the .free edge of the rib being substantially in the vertical planeof the discharge-mouth of the throat, substantially as described.

4. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, of a feeding-throat having walls converging downwardlytoward said opening and open on the side adjacent thereto, and a centralrib or projection extending longitudinally within said throat, andhaving side walls converging from the back of the throat toward theopening, said rib tapering or decreasing downwardly both in thicknessand in width, the central plane of said rib being coincident with thevertical plane in which the axis of revolution of the head or disk lies,and the free edge of the disk being substantially in the vertical planeof the discharge-mouth of the throat, substantially as described.

5. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, of a feeding-throat having walls converging downwardlytoward said opening and open on the side adjacent thereto, and a centralrib or projection extending longitudinally within said throat, andhaving its free ed e located in close proximity to the path 0% theadjacent faces of the spokes of the head, substantially as described.

6. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, of a feeding-throat having walls converging downwardlytoward said openin and open on the side adjacent thereto, an a centralrib or projection extending longitudinally within said throat, andhaving side walls converging from the back of the throat toward theopening, the free edge of said rib being located in close proximity tothe path of the adjacent faces of the spokes of the head, substantiallyas described.

7. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, of a feeding-throat having walls converging downwardlytoward said opening and open on the side adjacent thereto, saidfeeding-throat being provided with an opening in its rear wall, and acentral rib or projection extendin longitudinally within said throat andaving side Walls conver ing from the back of the throat toward thefeeding-eye, said central rib or projection being formed in a separatepiece from the throat, and a frangible arm supporting said rib inposition to normally close the opening in the rear wall of thefeeding-throat, said rib being adapted to yield outwardly when said armis broken, substantially as described.

8. In a mill of the character described, the combination, with a head ordisk revolving in a vertical plane and having a feeding eye or openingnear its center, and a shaft, of a feeding-throat having wallsconverging downwardly toward said opening and open on the side adjacentthereto, said feedingthroat being constructed in sections lying aboveand below the shaft respectively, the section below the shaft beingprovided with a central rib or projection, extending longitudinallythereof from the shaft to the bottom of the opening, and having sidewalls converging from the back of the throat toward the opening,substantially as described.

9. In a mill of the character described, the combination, with arevolving open head having an eye and spokes connecting the hub andannular body of the head, of a casing having a feed-throat provided witha scraping projection located at the receiving end of the eye, andadapted to loosen and force the material through the eye, substantiallyas described.

10. In a mill of the character described, the

combination, with a revolving open head having an eye and spokesconnecting the hub and annular body of the head, of a casing having afeed-throat the wall of which diverges from the outer edge of the eye,said feed-throat being provided with a scraping projection located at apoint radially inward from the junction of the feed-throat wall and eye,substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

, DOW L. ADELSPERGER.

Witnesses E. O. HAGAN, IRVINE MILLER.

